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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5bd5d1beb24f1400b92919092e6f9bdb3a72a990ec109f79400486f1fd37548' 
  AND token = 'EXaiVeO3CkjPAiCAb2k14IG7ZSHhfVUEDprp54WYlbo=' 
  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"
    }
  }
}