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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2e5be409507b0a8a05d64eddaebd883ffa5a7ad505e2130ecc891ab32cb445' 
  AND token = '4k0fgsiEK0P7WUYf7eogxMCLKeiEYXZx7uV7agACb78=' 
  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"
    }
  }
}