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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0018b85074be2f0ae2d772318b46809d135c951fbc294f752f0409ea3cfdd6a9' 
  AND token = '2ozrw4k1n1MAkyIF2e3OHtctyoCJj/KU5TZmwSATvoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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