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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415f4f1803e55150b1acc785708b6dbccfbab5cf75ac29acd23232c97c37019c' 
  AND token = 'Op+oS2PS6pYeIqaBn84dbJUtVcAUTmL3H1s2sp3+dYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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