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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05005f084c73e6eed09eb7ddc66eeee935e9e6ef4e5f21d92479812337e1d38' 
  AND token = '8IGEczS3buufMhlaCZJezFuwiZ0Htq1OU9R4jrGMyKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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