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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8933e0a4beda1dc810d79f665c0fc088a2ca7e9aa5cc069fc0fdf4081ecf50' 
  AND token = 'EAXjcdFIsmApOlu+9prZKtYyAGIRMxpgeIMrU8ZCD44=' 
  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"
    }
  }
}