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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3a3592907d029cde2e4576915589d5d52e9ecb220b176d5929ca1591a9d4ec' 
  AND token = 'iCgUmbKIQAQgqunMkRNk9Y53gerh902HwKL1+rXuCeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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