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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23abbeb314e7a9de07d7ad1c8715e060794740e4f3260a25c8bc835230648ec9' 
  AND token = 'UMaT9jzccuDZn5Cs8NqrbIkd9mHCV+XwlbCUAC27HYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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