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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7feac436cf051136eb48624eb54b9681f92843d1208c5a18a91cd74dd2effc4' 
  AND token = '3VHK7M13+7in8Sqxycht6ZO9CtMi1KM0f6Btm33XuFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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