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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6b26b3866e55a090865f14fda8c398aa3922441939cfd568a51ed2c8f52e68' 
  AND token = '+FX7Td/049lEcR6C9Njkwthdo+niF193Cn9C3i5RJ0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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