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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74808a084ec604d8c6ba897646b6661be286362076994e23472bbaac96d65305' 
  AND token = '7js2hNJnubYpG1to2jubzqJW8cGEocs8U/Fy1u4lTAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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