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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f33d0ce1053ca8efe5a7bc8b3c1c3ef0b026e33f908ac967558d975b396bb1' 
  AND token = '48mvPtsyfPHNS9zO88MpWwUCMh72TKq+jhfG/mhkIv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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