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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be7391f2500a33e80a8a9098f7b8818077130555e0c0d493df5bba01e56283b' 
  AND token = 'BVb15csUwVt6NznnEKkhHuti15R907r/FvfTsqt5eGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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