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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c7b90688e284f9e5bbf3c3d6ca3636d84b30689ae77a1e463c0bff01382dfd' 
  AND token = 'tV+bZNgJiAb9wRZ3lJ8C6OrSAefvdsQahTGQKkgmcpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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