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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7745b2b34e9c8c98be7938be5495c38d0e19ca05405fb024e0b496b171e66132' 
  AND token = 'V7pIZ8Uo01fCtsorxAg8G1JjsgJdjOHIIS7c7JB5Q74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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