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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37361db820e2804a6f873c616cc97b005bf2f865b3fef037e253fada13ff235a' 
  AND token = '2D72hCj/IDQ2FHvnH/eqsjzAJkDE4zTbi5aDVyqKd08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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