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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2fffec220e1763cb25e1813724409f28930c57ab48ed79f008dab0bd4f37fe' 
  AND token = 'yZ4vht8wnndFVsGxM5GE6tlpaMQp1gKHjhzdk2k4Mag=' 
  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"
    }
  }
}