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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b008e2951c3cf40f76efe30d4cdf99205a8c12a1c63c21ca65b0882f905b9e' 
  AND token = 'fGO/bPct79sJzEw8z2rCLhH3iIi9Nt6t1FvLiKVcCjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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