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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dade27ac7e9dd921681907c487927b1f3004c49bc5ea0046c6b44b3a4cfa2b1b' 
  AND token = 'w0fICmSFCqDd+CtwOtUL1vv5MjUBJVP7Jaav6GV+m0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}