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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860c5b961840d21a2d82d944854a082a654de86795967d49d22a4ca477e341ba' 
  AND token = 'ZtliDuuNFD5fqUP0pZp+Yc5feA8Vm5Ceq5hiqZd/75A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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