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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6a41965e4a57571130f3e7ca5876f439e45a557fa2a8af09d6daeced06e0261' 
  AND token = 'IaSVIU1ywKV6sE2E9ZMxe7QHzmknvQQ8K7OqWKH2Lsc=' 
  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"
    }
  }
}