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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ba5b89ee8233c34ffa587f8337e2d7eb697209748259bcf29e3794c00efc8a' 
  AND token = 'pcOZFJU04wdA0pkiduEuMxMN8b5S461ATLpTUTg3ufA=' 
  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"
    }
  }
}