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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9f8c05d291d46a787b0e6bff606ab71f5bbf3a5848e7b71de1a5f1c0b2cee2' 
  AND token = 'CeS63PIVojYx0LND7tj5+UejXHV/4Yk6eBbFI41oaNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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