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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '122f785da28fa1e54695406444f285eebef031a9c0f9f01b285c8ae645eba650' 
  AND token = 'wWLpfMibv9oG/6mDa4B1cwhUknFNgLoi1XkqQTeT+N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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