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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd59e7639ebf9f7a432ca6a84e49cbabf75d234cae75f55a6dae8df0e334c5dd' 
  AND token = '+vfbLx0xyYkTo7TTejbAKGmV6fRTnJKAEENh2Mu9Nbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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