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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee500c83b1b01dfc55d931c9bebeefef7b2ac4fc33f4741b1c930c9f537358f8' 
  AND token = '+czzzkYuA6ibMFi42ztwGDwvlSWUuK/eSHyxSpflpBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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