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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030845437c68a39b62f367aa0c4d784ec82e9cc90a51dc03a7df42eae4ea1dd1' 
  AND token = 'ZCaavzhnXjmi6Gs/4FJ4n4HNnfUTKjmma78JxWR+HVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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