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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '758d2b9323a73fd141112cdc167a61cb764fdda3e4c558e2448ced1b22c928b2' 
  AND token = '9f4BD3Eon8VttZqCKpLnVcea9vhapZRmNJJ68Y9OYk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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