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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a5aac43dd708a297705972ae0d0b28fc5ace3851ed06d763c3f6477086f8f0' 
  AND token = 'YD3g5ta7pyd2q0CSxCRj2ZRx565ws8JaZlkvE4dDR4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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