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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7816af7e1802e5110469826b893a13160469c22228ab6f3758f6d462463134b1' 
  AND token = 'lL8kynu5Vg/R6Hku4D5XjQQYllySL0kucok9LZeSB+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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