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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '120e6d6d62c0c74adac33e3bb1d4282f99cf916d428208d741c72035aa98d28d' 
  AND token = 'bY32qy+OiD9Dk/S1Qd4qOz/z3kWju8jjyHz6Aqw+f6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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