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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '637b0b02bdbc2a3aa9a7dbd6a058dc6a1295a313df140511a48c604430334cff' 
  AND token = 'q/PHqCW31bdhWaS/XJVIO9BWmQLQ9z0GuMQSjlt5vh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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