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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc2c56608fb23edd233ef3a82928467614844d531485bf608cbba5f0a95ff8a' 
  AND token = 'S0MZ/hr4NppFQe7QQgtVMutcI+cGKmT9eNdPp3oEMBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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