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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b639c9fafa4e77c4bfb50d1f16941bf73b886089e6d382dee95a630feef3398d' 
  AND token = 'Y+dYDYBkpcZHMOoXEKU9th0/vycYth2SJmC64IX8pHk=' 
  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"
    }
  }
}