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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab413a62c97219a0bfd978a38a1dff900439baae9c9f14a54f625bd67d3a7548' 
  AND token = 'iKcF9Vh7WcEpyZ6soMIU3O/Jkk5lWl5f0+a70h9dfCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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