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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb2bf745e72aee418861b2d3082bf6b3035f4a4686cb1ce2f6c824872e60a53' 
  AND token = 'ATmR5/zMg4nObMajjmA4nZ20+09dqsNaNSpgC/uNzMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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