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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a455f80bd08740e59d40a8fce9199f2d74c6f3152945158c0668bc4e9791fd09' 
  AND token = 'GG7NE4F1bA0ZZSlDFwwOMvk2EoeEgOzNrdTaKX9Qg+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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