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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a7a6a529ff48578c946bd9f05e7f8fca951ce077afe1738eafb39f4a3c8fa6' 
  AND token = 'lZ2M8dvyc7sS4cT5pLRy19JaeEpQolbTPtK/9JvqeRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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