SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0f29c67f487309a1f7c91532fbda56bdca05ddceca26985f90733e65019401' 
  AND token = 'Qk+PlVlr2AH6tVrXY/rjBRibR/58qpm6s0xJ2J1hDUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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