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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c5b6c0d403045b1cdb66a33ab311b551d5b890770573a1704c57f0c212faa3' 
  AND token = '54gPVku/EjK9Cdc7pAb6M6uanwDYttR4iwF5MAzjW6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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