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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603246c9845b5a252120f08b18aa3669c4e558d8f637eca16a6e96a16d48081f' 
  AND token = 'yCk7Ly3C4r/QcOqPGN3j1b59IEM+LOUKCJYve49DsxM=' 
  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"
    }
  }
}