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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0dcc1dd04e12d9bb2adc5d3c88bb10b38ca085f7636564706e03ec33d8ef029' 
  AND token = 'cfihVWkDQ0mN20als4Q2KxV9TB88/oSr/eZkc+WBbMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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