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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139d466fb2b4c12596181dfe5d6b931fcf5d4e9d801824d8d3c80d5d37dd64b8' 
  AND token = '/34+KP1rZGyn9gQnpr29wnXGqZuOfq+ZkfkpKGSSWrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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