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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd995afbc5f6bceb1146569ba1a15a36c7d743c9bd4a02b53163543f8d907cdc0' 
  AND token = '5YHZcPzL9+PS/eDCJkQhu3VF8JX+5bKYs6oa2zpIsi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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