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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ab94b1ad8de116932dfc6c76e086789516fe3d36a7f8a48d500b391add9bda' 
  AND token = 'BD2yLMheuH7vzz/1A5CfhZJszp8n3iOpKx1tGn0Vcmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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