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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c37151b5a90323dbae3b859b37a7319fb1ee1b61443b34f40fe19abd4a6f6d' 
  AND token = '5a2OZRkZ4Wdq5ODsFszb6aZ+84DitGZec3WT7r1C0LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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