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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa66cb4c7bd2115b2afe3de6cd757ee68e136b41ab73a729018e5dca1246d38b' 
  AND token = 'u0V6tGvD7z6ygtK/Nxr/l8sTgawVnVNC02LFyp+VFtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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