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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28367a54a5ee88317de4f1a5463d9818541af97f6ae3458c43149818073d4caf' 
  AND token = 'bOtC8qV0EXVoxVZunMBc+aAQY2gjk7zrDRfz8IZ6fAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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