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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe82813af2d4c09661a964aa1c109b3652a3fc259d5a9200554a6668872e1bb' 
  AND token = 'rrHSDYK+lHLtjND7kERGmwCol/ymhm80iGzkp4itLM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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