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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21cc406d72f21c427c8b303b02bd4369f7ee174877306694d20e884dab138d87' 
  AND token = 'A8Rtcm96T0soNK91fWFk9/35+oeljER4ddGHIeZ5+iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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