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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c952ff71f98e2900660bc0b86a4ed3cef3e6f54a4c78f837739ea074a4a7fee' 
  AND token = 'W7atzK7w4xUg0M/M46KgDesMQkTFLeb/2ZCN70uFRlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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